difference between Orthogonal and Isometric

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I wanna note this myself so I can't forget this stuff.

Orthogonal vs Isometric Via StackExchange.com
or this link StackExchange Orthogonal vs Isometric

Orthogonal vs Isometric via Yahoo Asnwers

With regards to foreshortened, according to Wikipedia on Perspective, it means as,

Foreshortened: the size of an object's dimensions along the line of sight are relatively shorter than dimensions across the line of sight

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